Luke 22:43

There appeared an angel - from heaven - It was as necessary that the fullest evidence should be given, not only of our Lord's Divinity, but also of his humanity: his miracles sufficiently attested the former; his hunger, weariness, and agony in the garden, as well as his death and burial, were proofs of the latter. As man, he needs the assistance of an angel to support his body, worn down by fatigue and suffering. See at the end of Luke 22:44 (note).

Strengthening him - His human nature, to sustain the great burden that was upon his soul. Some have supposed from this that he was not divine as well as human; for if he was "God," how could an angel give any strength or comfort? and why did not the divine nature "alone" sustain the human? But the fact that he was "divine" does not affect the case at all. It might be asked with the same propriety, If he was, as all admit, the friend of God, and beloved of God, and holy, why, if he was a mere man, did not "God" sustain him alone, without an angel's intervening? But the objection in neither case would have any force. The "man, Christ Jesus," was suffering. His human nature was in agony, and it is the "manner" of God to sustain the afflicted by the intervention of others; nor was there any more "unfitness" in sustaining the human nature of his Son in this manner than any other sufferer.

22:43 Strengthening him - Lest his body should sink and die before the time.